[svn] Rewrite canSeeOrDetect function.

Minor change on trigger creatures.
Remove some unused hacks in scripts.

--HG--
branch : trunk

src/game/Object.cpp

@@ -1486,7 +1486,7 @@ Creature* WorldObject::SummonCreature(uint32 id, float x, float y, float z, floa
     {
         if(GetTypeId() == TYPEID_UNIT || GetTypeId() == TYPEID_PLAYER)
             pCreature->setFaction(((Unit*)this)->getFaction());
-        pCreature->CastSpell(pCreature, pCreature->m_spells[0], true, 0, 0, GetGUID());
+        pCreature->CastSpell(pCreature, pCreature->m_spells[0], false, 0, 0, GetGUID());
     }
 
     //return the creature therewith the summoner has access to it